#include<stdio.h>
#include<stdlib.h>


int main()
{
    //自定义
    printf("MYENV:%s\n",getenv("MYENV"));
    printf("MYVAL:%s\n",getenv("MYVAL"));


    //系统
    printf("PATH:%s\n",getenv("PATH"));
    printf("HOME:%s\n",getenv("HOME"));
    return 0;
}
